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The Gray County blaze scorched 100,000 acres, but has since been contained, Martin said. State fire marshals are working to determine the cause of the fire.

The three victims were identified as Cody Crockett, Sydney Wallace and Sloan Everett, according to Richard Peet, a county judge and the Gray County Director of Emergency Management. Wallace died from smoke inhalation while Everett and Crockett were badly burned, he told CNN.

The Hoover Volunteer Fire Department in Gray County said in a Facebook post that all of its units had returned home safely.

One person died in a fire in Lipscomb County, according to Sheriff Kenneth Eggleston -- and another fire-related death was reported in Ochiltree County.

Wildfires have forced evacuations in Texas, Oklahoma, Kansas and Colorado.

Firefighters injured

As many as five firefighters were injured while fighting another fire near Amarillo, Texas. Several blazes merged into one massive fire reportedly 12 to 15 miles across, according to Potter County Sheriff's Office Capt. John Coffee.

The Texas A&M Forest Service is monitoring two major fires that remain active in the Texas Panhandle.

The largest of the two is the Perryton fire, which is about 300,000 acres wide and only 5 percent contained. The fire, which is located in Ochiltree and Lipscomb counties, has destroyed two homes.